2 * pNFS functions to call and manage layout drivers.
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_page.h>
32 #include <linux/module.h>
37 #define NFSDBG_FACILITY NFSDBG_PNFS
38 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43 * protects pnfs_modules_tbl.
45 static DEFINE_SPINLOCK(pnfs_spinlock);
48 * pnfs_modules_tbl holds all pnfs modules
50 static LIST_HEAD(pnfs_modules_tbl);
52 /* Return the registered pnfs layout driver module matching given id */
53 static struct pnfs_layoutdriver_type *
54 find_pnfs_driver_locked(u32 id)
56 struct pnfs_layoutdriver_type *local;
58 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
63 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
67 static struct pnfs_layoutdriver_type *
68 find_pnfs_driver(u32 id)
70 struct pnfs_layoutdriver_type *local;
72 spin_lock(&pnfs_spinlock);
73 local = find_pnfs_driver_locked(id);
74 if (local != NULL && !try_module_get(local->owner)) {
75 dprintk("%s: Could not grab reference on module\n", __func__);
78 spin_unlock(&pnfs_spinlock);
83 unset_pnfs_layoutdriver(struct nfs_server *nfss)
85 if (nfss->pnfs_curr_ld) {
86 if (nfss->pnfs_curr_ld->clear_layoutdriver)
87 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
88 /* Decrement the MDS count. Purge the deviceid cache if zero */
89 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
90 nfs4_deviceid_purge_client(nfss->nfs_client);
91 module_put(nfss->pnfs_curr_ld->owner);
93 nfss->pnfs_curr_ld = NULL;
97 * Try to set the server's pnfs module to the pnfs layout type specified by id.
98 * Currently only one pNFS layout driver per filesystem is supported.
100 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
103 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
106 struct pnfs_layoutdriver_type *ld_type = NULL;
110 if (!(server->nfs_client->cl_exchange_flags &
111 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
112 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
113 __func__, id, server->nfs_client->cl_exchange_flags);
116 ld_type = find_pnfs_driver(id);
118 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
119 ld_type = find_pnfs_driver(id);
121 dprintk("%s: No pNFS module found for %u.\n",
126 server->pnfs_curr_ld = ld_type;
127 if (ld_type->set_layoutdriver
128 && ld_type->set_layoutdriver(server, mntfh)) {
129 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
130 "driver %u.\n", __func__, id);
131 module_put(ld_type->owner);
134 /* Bump the MDS count */
135 atomic_inc(&server->nfs_client->cl_mds_count);
137 dprintk("%s: pNFS module for %u set\n", __func__, id);
141 dprintk("%s: Using NFSv4 I/O\n", __func__);
142 server->pnfs_curr_ld = NULL;
146 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
148 int status = -EINVAL;
149 struct pnfs_layoutdriver_type *tmp;
151 if (ld_type->id == 0) {
152 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
155 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
156 printk(KERN_ERR "NFS: %s Layout driver must provide "
157 "alloc_lseg and free_lseg.\n", __func__);
161 spin_lock(&pnfs_spinlock);
162 tmp = find_pnfs_driver_locked(ld_type->id);
164 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
166 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
169 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
170 __func__, ld_type->id);
172 spin_unlock(&pnfs_spinlock);
176 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
179 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
181 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
182 spin_lock(&pnfs_spinlock);
183 list_del(&ld_type->pnfs_tblid);
184 spin_unlock(&pnfs_spinlock);
186 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
189 * pNFS client layout cache
192 /* Need to hold i_lock if caller does not already hold reference */
194 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
196 atomic_inc(&lo->plh_refcount);
199 static struct pnfs_layout_hdr *
200 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
202 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
203 return ld->alloc_layout_hdr(ino, gfp_flags);
207 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
209 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
210 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
212 if (!list_empty(&lo->plh_layouts)) {
213 struct nfs_client *clp = server->nfs_client;
215 spin_lock(&clp->cl_lock);
216 list_del_init(&lo->plh_layouts);
217 spin_unlock(&clp->cl_lock);
219 put_rpccred(lo->plh_lc_cred);
220 return ld->free_layout_hdr(lo);
224 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
226 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
227 dprintk("%s: freeing layout cache %p\n", __func__, lo);
229 /* Reset MDS Threshold I/O counters */
235 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
237 struct inode *inode = lo->plh_inode;
239 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
240 pnfs_detach_layout_hdr(lo);
241 spin_unlock(&inode->i_lock);
242 pnfs_free_layout_hdr(lo);
247 pnfs_iomode_to_fail_bit(u32 iomode)
249 return iomode == IOMODE_RW ?
250 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
254 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
256 lo->plh_retry_timestamp = jiffies;
257 if (test_and_set_bit(fail_bit, &lo->plh_flags))
258 atomic_inc(&lo->plh_refcount);
262 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
264 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
265 atomic_dec(&lo->plh_refcount);
269 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
271 struct inode *inode = lo->plh_inode;
272 struct pnfs_layout_range range = {
275 .length = NFS4_MAX_UINT64,
279 spin_lock(&inode->i_lock);
280 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
281 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
282 spin_unlock(&inode->i_lock);
283 pnfs_free_lseg_list(&head);
284 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
285 iomode == IOMODE_RW ? "RW" : "READ");
289 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
291 unsigned long start, end;
292 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
294 if (test_bit(fail_bit, &lo->plh_flags) == 0)
297 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
298 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
299 /* It is time to retry the failed layoutgets */
300 pnfs_layout_clear_fail_bit(lo, fail_bit);
307 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
309 INIT_LIST_HEAD(&lseg->pls_list);
310 INIT_LIST_HEAD(&lseg->pls_lc_list);
311 atomic_set(&lseg->pls_refcount, 1);
313 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
314 lseg->pls_layout = lo;
317 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
319 struct inode *ino = lseg->pls_layout->plh_inode;
321 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
325 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
326 struct pnfs_layout_segment *lseg)
328 struct inode *inode = lo->plh_inode;
330 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
331 list_del_init(&lseg->pls_list);
332 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
333 atomic_dec(&lo->plh_refcount);
334 if (list_empty(&lo->plh_segs))
335 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
336 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
340 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
342 struct pnfs_layout_hdr *lo;
348 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
349 atomic_read(&lseg->pls_refcount),
350 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
351 lo = lseg->pls_layout;
352 inode = lo->plh_inode;
353 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
354 pnfs_get_layout_hdr(lo);
355 pnfs_layout_remove_lseg(lo, lseg);
356 spin_unlock(&inode->i_lock);
357 pnfs_free_lseg(lseg);
358 pnfs_put_layout_hdr(lo);
361 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
364 end_offset(u64 start, u64 len)
369 return end >= start ? end : NFS4_MAX_UINT64;
372 /* last octet in a range */
374 last_byte_offset(u64 start, u64 len)
380 return end > start ? end - 1 : NFS4_MAX_UINT64;
384 * is l2 fully contained in l1?
386 * [----------------------------------)
391 lo_seg_contained(struct pnfs_layout_range *l1,
392 struct pnfs_layout_range *l2)
394 u64 start1 = l1->offset;
395 u64 end1 = end_offset(start1, l1->length);
396 u64 start2 = l2->offset;
397 u64 end2 = end_offset(start2, l2->length);
399 return (start1 <= start2) && (end1 >= end2);
403 * is l1 and l2 intersecting?
405 * [----------------------------------)
410 lo_seg_intersecting(struct pnfs_layout_range *l1,
411 struct pnfs_layout_range *l2)
413 u64 start1 = l1->offset;
414 u64 end1 = end_offset(start1, l1->length);
415 u64 start2 = l2->offset;
416 u64 end2 = end_offset(start2, l2->length);
418 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
419 (end2 == NFS4_MAX_UINT64 || end2 > start1);
423 should_free_lseg(struct pnfs_layout_range *lseg_range,
424 struct pnfs_layout_range *recall_range)
426 return (recall_range->iomode == IOMODE_ANY ||
427 lseg_range->iomode == recall_range->iomode) &&
428 lo_seg_intersecting(lseg_range, recall_range);
431 /* Returns 1 if lseg is removed from list, 0 otherwise */
432 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
433 struct list_head *tmp_list)
437 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
438 /* Remove the reference keeping the lseg in the
439 * list. It will now be removed when all
440 * outstanding io is finished.
442 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
443 atomic_read(&lseg->pls_refcount));
444 if (atomic_dec_and_test(&lseg->pls_refcount)) {
445 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
446 list_add(&lseg->pls_list, tmp_list);
453 /* Returns count of number of matching invalid lsegs remaining in list
457 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
458 struct list_head *tmp_list,
459 struct pnfs_layout_range *recall_range)
461 struct pnfs_layout_segment *lseg, *next;
462 int invalid = 0, removed = 0;
464 dprintk("%s:Begin lo %p\n", __func__, lo);
466 if (list_empty(&lo->plh_segs))
468 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
470 should_free_lseg(&lseg->pls_range, recall_range)) {
471 dprintk("%s: freeing lseg %p iomode %d "
472 "offset %llu length %llu\n", __func__,
473 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
474 lseg->pls_range.length);
476 removed += mark_lseg_invalid(lseg, tmp_list);
478 dprintk("%s:Return %i\n", __func__, invalid - removed);
479 return invalid - removed;
482 /* note free_me must contain lsegs from a single layout_hdr */
484 pnfs_free_lseg_list(struct list_head *free_me)
486 struct pnfs_layout_segment *lseg, *tmp;
488 if (list_empty(free_me))
491 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
492 list_del(&lseg->pls_list);
493 pnfs_free_lseg(lseg);
498 pnfs_destroy_layout(struct nfs_inode *nfsi)
500 struct pnfs_layout_hdr *lo;
503 spin_lock(&nfsi->vfs_inode.i_lock);
506 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
507 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
508 pnfs_get_layout_hdr(lo);
509 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
510 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
511 spin_unlock(&nfsi->vfs_inode.i_lock);
512 pnfs_free_lseg_list(&tmp_list);
513 pnfs_put_layout_hdr(lo);
515 spin_unlock(&nfsi->vfs_inode.i_lock);
517 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
520 * Called by the state manger to remove all layouts established under an
524 pnfs_destroy_all_layouts(struct nfs_client *clp)
526 struct nfs_server *server;
527 struct pnfs_layout_hdr *lo;
530 nfs4_deviceid_mark_client_invalid(clp);
531 nfs4_deviceid_purge_client(clp);
533 spin_lock(&clp->cl_lock);
535 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
536 if (!list_empty(&server->layouts))
537 list_splice_init(&server->layouts, &tmp_list);
540 spin_unlock(&clp->cl_lock);
542 while (!list_empty(&tmp_list)) {
543 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
545 dprintk("%s freeing layout for inode %lu\n", __func__,
546 lo->plh_inode->i_ino);
547 list_del_init(&lo->plh_layouts);
548 pnfs_destroy_layout(NFS_I(lo->plh_inode));
552 /* update lo->plh_stateid with new if is more recent */
554 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
559 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
560 newseq = be32_to_cpu(new->seqid);
561 if (list_empty(&lo->plh_segs) || (int)(newseq - oldseq) > 0) {
562 nfs4_stateid_copy(&lo->plh_stateid, new);
563 if (update_barrier) {
564 u32 new_barrier = be32_to_cpu(new->seqid);
566 if ((int)(new_barrier - lo->plh_barrier))
567 lo->plh_barrier = new_barrier;
569 /* Because of wraparound, we want to keep the barrier
570 * "close" to the current seqids. It needs to be
571 * within 2**31 to count as "behind", so if it
572 * gets too near that limit, give us a litle leeway
573 * and bring it to within 2**30.
574 * NOTE - and yes, this is all unsigned arithmetic.
576 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
577 lo->plh_barrier = newseq - (1 << 30);
582 /* lget is set to 1 if called from inside send_layoutget call chain */
584 pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
588 (int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0)
590 return lo->plh_block_lgets ||
591 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
592 (list_empty(&lo->plh_segs) &&
593 (atomic_read(&lo->plh_outstanding) > lget));
597 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
598 struct nfs4_state *open_state)
602 dprintk("--> %s\n", __func__);
603 spin_lock(&lo->plh_inode->i_lock);
604 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
606 } else if (list_empty(&lo->plh_segs)) {
610 seq = read_seqbegin(&open_state->seqlock);
611 nfs4_stateid_copy(dst, &open_state->stateid);
612 } while (read_seqretry(&open_state->seqlock, seq));
614 nfs4_stateid_copy(dst, &lo->plh_stateid);
615 spin_unlock(&lo->plh_inode->i_lock);
616 dprintk("<-- %s\n", __func__);
621 * Get layout from server.
622 * for now, assume that whole file layouts are requested.
624 * arg->length: all ones
626 static struct pnfs_layout_segment *
627 send_layoutget(struct pnfs_layout_hdr *lo,
628 struct nfs_open_context *ctx,
629 struct pnfs_layout_range *range,
632 struct inode *ino = lo->plh_inode;
633 struct nfs_server *server = NFS_SERVER(ino);
634 struct nfs4_layoutget *lgp;
635 struct pnfs_layout_segment *lseg;
637 dprintk("--> %s\n", __func__);
640 lgp = kzalloc(sizeof(*lgp), gfp_flags);
644 lgp->args.minlength = PAGE_CACHE_SIZE;
645 if (lgp->args.minlength > range->length)
646 lgp->args.minlength = range->length;
647 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
648 lgp->args.range = *range;
649 lgp->args.type = server->pnfs_curr_ld->id;
650 lgp->args.inode = ino;
651 lgp->args.ctx = get_nfs_open_context(ctx);
652 lgp->gfp_flags = gfp_flags;
654 /* Synchronously retrieve layout information from server and
657 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
659 switch (PTR_ERR(lseg)) {
664 /* remember that LAYOUTGET failed and suspend trying */
665 pnfs_layout_io_set_failed(lo, range->iomode);
674 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
675 * when the layout segment list is empty.
677 * Note that a pnfs_layout_hdr can exist with an empty layout segment
678 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
679 * deviceid is marked invalid.
682 _pnfs_return_layout(struct inode *ino)
684 struct pnfs_layout_hdr *lo = NULL;
685 struct nfs_inode *nfsi = NFS_I(ino);
687 struct nfs4_layoutreturn *lrp;
688 nfs4_stateid stateid;
689 int status = 0, empty;
691 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
693 spin_lock(&ino->i_lock);
696 spin_unlock(&ino->i_lock);
697 dprintk("NFS: %s no layout to return\n", __func__);
700 stateid = nfsi->layout->plh_stateid;
701 /* Reference matched in nfs4_layoutreturn_release */
702 pnfs_get_layout_hdr(lo);
703 empty = list_empty(&lo->plh_segs);
704 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
705 /* Don't send a LAYOUTRETURN if list was initially empty */
707 spin_unlock(&ino->i_lock);
708 pnfs_put_layout_hdr(lo);
709 dprintk("NFS: %s no layout segments to return\n", __func__);
712 lo->plh_block_lgets++;
713 spin_unlock(&ino->i_lock);
714 pnfs_free_lseg_list(&tmp_list);
716 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
718 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
719 if (unlikely(lrp == NULL)) {
721 spin_lock(&ino->i_lock);
722 lo->plh_block_lgets--;
723 spin_unlock(&ino->i_lock);
724 pnfs_put_layout_hdr(lo);
728 lrp->args.stateid = stateid;
729 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
730 lrp->args.inode = ino;
731 lrp->args.layout = lo;
732 lrp->clp = NFS_SERVER(ino)->nfs_client;
734 status = nfs4_proc_layoutreturn(lrp);
736 dprintk("<-- %s status: %d\n", __func__, status);
739 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
741 bool pnfs_roc(struct inode *ino)
743 struct pnfs_layout_hdr *lo;
744 struct pnfs_layout_segment *lseg, *tmp;
748 spin_lock(&ino->i_lock);
749 lo = NFS_I(ino)->layout;
750 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
751 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
753 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
754 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
755 mark_lseg_invalid(lseg, &tmp_list);
760 lo->plh_block_lgets++;
761 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
762 spin_unlock(&ino->i_lock);
763 pnfs_free_lseg_list(&tmp_list);
767 spin_unlock(&ino->i_lock);
771 void pnfs_roc_release(struct inode *ino)
773 struct pnfs_layout_hdr *lo;
775 spin_lock(&ino->i_lock);
776 lo = NFS_I(ino)->layout;
777 lo->plh_block_lgets--;
778 if (atomic_dec_and_test(&lo->plh_refcount)) {
779 pnfs_detach_layout_hdr(lo);
780 spin_unlock(&ino->i_lock);
781 pnfs_free_layout_hdr(lo);
783 spin_unlock(&ino->i_lock);
786 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
788 struct pnfs_layout_hdr *lo;
790 spin_lock(&ino->i_lock);
791 lo = NFS_I(ino)->layout;
792 if ((int)(barrier - lo->plh_barrier) > 0)
793 lo->plh_barrier = barrier;
794 spin_unlock(&ino->i_lock);
797 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
799 struct nfs_inode *nfsi = NFS_I(ino);
800 struct pnfs_layout_hdr *lo;
801 struct pnfs_layout_segment *lseg;
805 spin_lock(&ino->i_lock);
806 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
807 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
808 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
813 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
815 /* Since close does not return a layout stateid for use as
816 * a barrier, we choose the worst-case barrier.
818 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
820 spin_unlock(&ino->i_lock);
825 * Compare two layout segments for sorting into layout cache.
826 * We want to preferentially return RW over RO layouts, so ensure those
830 cmp_layout(struct pnfs_layout_range *l1,
831 struct pnfs_layout_range *l2)
835 /* high offset > low offset */
836 d = l1->offset - l2->offset;
840 /* short length > long length */
841 d = l2->length - l1->length;
845 /* read > read/write */
846 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
850 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
851 struct pnfs_layout_segment *lseg)
853 struct pnfs_layout_segment *lp;
855 dprintk("%s:Begin\n", __func__);
857 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
858 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
860 list_add_tail(&lseg->pls_list, &lp->pls_list);
861 dprintk("%s: inserted lseg %p "
862 "iomode %d offset %llu length %llu before "
863 "lp %p iomode %d offset %llu length %llu\n",
864 __func__, lseg, lseg->pls_range.iomode,
865 lseg->pls_range.offset, lseg->pls_range.length,
866 lp, lp->pls_range.iomode, lp->pls_range.offset,
867 lp->pls_range.length);
870 list_add_tail(&lseg->pls_list, &lo->plh_segs);
871 dprintk("%s: inserted lseg %p "
872 "iomode %d offset %llu length %llu at tail\n",
873 __func__, lseg, lseg->pls_range.iomode,
874 lseg->pls_range.offset, lseg->pls_range.length);
876 pnfs_get_layout_hdr(lo);
878 dprintk("%s:Return\n", __func__);
881 static struct pnfs_layout_hdr *
882 alloc_init_layout_hdr(struct inode *ino,
883 struct nfs_open_context *ctx,
886 struct pnfs_layout_hdr *lo;
888 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
891 atomic_set(&lo->plh_refcount, 1);
892 INIT_LIST_HEAD(&lo->plh_layouts);
893 INIT_LIST_HEAD(&lo->plh_segs);
894 INIT_LIST_HEAD(&lo->plh_bulk_recall);
896 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
900 static struct pnfs_layout_hdr *
901 pnfs_find_alloc_layout(struct inode *ino,
902 struct nfs_open_context *ctx,
905 struct nfs_inode *nfsi = NFS_I(ino);
906 struct pnfs_layout_hdr *new = NULL;
908 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
910 if (nfsi->layout != NULL)
912 spin_unlock(&ino->i_lock);
913 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
914 spin_lock(&ino->i_lock);
916 if (likely(nfsi->layout == NULL)) { /* Won the race? */
920 pnfs_free_layout_hdr(new);
922 pnfs_get_layout_hdr(nfsi->layout);
927 * iomode matching rules:
938 is_matching_lseg(struct pnfs_layout_range *ls_range,
939 struct pnfs_layout_range *range)
941 struct pnfs_layout_range range1;
943 if ((range->iomode == IOMODE_RW &&
944 ls_range->iomode != IOMODE_RW) ||
945 !lo_seg_intersecting(ls_range, range))
948 /* range1 covers only the first byte in the range */
951 return lo_seg_contained(ls_range, &range1);
955 * lookup range in layout
957 static struct pnfs_layout_segment *
958 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
959 struct pnfs_layout_range *range)
961 struct pnfs_layout_segment *lseg, *ret = NULL;
963 dprintk("%s:Begin\n", __func__);
965 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
966 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
967 is_matching_lseg(&lseg->pls_range, range)) {
968 ret = pnfs_get_lseg(lseg);
971 if (lseg->pls_range.offset > range->offset)
975 dprintk("%s:Return lseg %p ref %d\n",
976 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
981 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
982 * to the MDS or over pNFS
984 * The nfs_inode read_io and write_io fields are cumulative counters reset
985 * when there are no layout segments. Note that in pnfs_update_layout iomode
986 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
989 * A return of true means use MDS I/O.
992 * If a file's size is smaller than the file size threshold, data accesses
993 * SHOULD be sent to the metadata server. If an I/O request has a length that
994 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
995 * server. If both file size and I/O size are provided, the client SHOULD
996 * reach or exceed both thresholds before sending its read or write
997 * requests to the data server.
999 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1000 struct inode *ino, int iomode)
1002 struct nfs4_threshold *t = ctx->mdsthreshold;
1003 struct nfs_inode *nfsi = NFS_I(ino);
1004 loff_t fsize = i_size_read(ino);
1005 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1010 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1011 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1015 if (t->bm & THRESHOLD_RD) {
1016 dprintk("%s fsize %llu\n", __func__, fsize);
1018 if (fsize < t->rd_sz)
1021 if (t->bm & THRESHOLD_RD_IO) {
1022 dprintk("%s nfsi->read_io %llu\n", __func__,
1025 if (nfsi->read_io < t->rd_io_sz)
1030 if (t->bm & THRESHOLD_WR) {
1031 dprintk("%s fsize %llu\n", __func__, fsize);
1033 if (fsize < t->wr_sz)
1036 if (t->bm & THRESHOLD_WR_IO) {
1037 dprintk("%s nfsi->write_io %llu\n", __func__,
1040 if (nfsi->write_io < t->wr_io_sz)
1045 if (size_set && io_set) {
1048 } else if (size || io)
1051 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1056 * Layout segment is retreived from the server if not cached.
1057 * The appropriate layout segment is referenced and returned to the caller.
1059 struct pnfs_layout_segment *
1060 pnfs_update_layout(struct inode *ino,
1061 struct nfs_open_context *ctx,
1064 enum pnfs_iomode iomode,
1067 struct pnfs_layout_range arg = {
1073 struct nfs_server *server = NFS_SERVER(ino);
1074 struct nfs_client *clp = server->nfs_client;
1075 struct pnfs_layout_hdr *lo;
1076 struct pnfs_layout_segment *lseg = NULL;
1079 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1082 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1085 spin_lock(&ino->i_lock);
1086 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1088 spin_unlock(&ino->i_lock);
1092 /* Do we even need to bother with this? */
1093 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1094 dprintk("%s matches recall, use MDS\n", __func__);
1098 /* if LAYOUTGET already failed once we don't try again */
1099 if (pnfs_layout_io_test_failed(lo, iomode))
1102 /* Check to see if the layout for the given range already exists */
1103 lseg = pnfs_find_lseg(lo, &arg);
1107 if (pnfs_layoutgets_blocked(lo, NULL, 0))
1109 atomic_inc(&lo->plh_outstanding);
1111 if (list_empty(&lo->plh_segs))
1114 spin_unlock(&ino->i_lock);
1116 /* The lo must be on the clp list if there is any
1117 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1119 spin_lock(&clp->cl_lock);
1120 BUG_ON(!list_empty(&lo->plh_layouts));
1121 list_add_tail(&lo->plh_layouts, &server->layouts);
1122 spin_unlock(&clp->cl_lock);
1125 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1127 arg.offset -= pg_offset;
1128 arg.length += pg_offset;
1130 if (arg.length != NFS4_MAX_UINT64)
1131 arg.length = PAGE_CACHE_ALIGN(arg.length);
1133 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1134 atomic_dec(&lo->plh_outstanding);
1136 pnfs_put_layout_hdr(lo);
1138 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1139 "(%s, offset: %llu, length: %llu)\n",
1140 __func__, ino->i_sb->s_id,
1141 (unsigned long long)NFS_FILEID(ino),
1142 lseg == NULL ? "not found" : "found",
1143 iomode==IOMODE_RW ? "read/write" : "read-only",
1144 (unsigned long long)pos,
1145 (unsigned long long)count);
1148 spin_unlock(&ino->i_lock);
1149 goto out_put_layout_hdr;
1151 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1153 struct pnfs_layout_segment *
1154 pnfs_layout_process(struct nfs4_layoutget *lgp)
1156 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1157 struct nfs4_layoutget_res *res = &lgp->res;
1158 struct pnfs_layout_segment *lseg;
1159 struct inode *ino = lo->plh_inode;
1162 /* Inject layout blob into I/O device driver */
1163 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1164 if (!lseg || IS_ERR(lseg)) {
1168 status = PTR_ERR(lseg);
1169 dprintk("%s: Could not allocate layout: error %d\n",
1174 spin_lock(&ino->i_lock);
1175 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1176 dprintk("%s forget reply due to recall\n", __func__);
1177 goto out_forget_reply;
1180 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1181 dprintk("%s forget reply due to state\n", __func__);
1182 goto out_forget_reply;
1185 /* Done processing layoutget. Set the layout stateid */
1186 pnfs_set_layout_stateid(lo, &res->stateid, false);
1188 init_lseg(lo, lseg);
1189 lseg->pls_range = res->range;
1190 pnfs_get_lseg(lseg);
1191 pnfs_layout_insert_lseg(lo, lseg);
1193 if (res->return_on_close) {
1194 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1195 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1198 spin_unlock(&ino->i_lock);
1201 return ERR_PTR(status);
1204 spin_unlock(&ino->i_lock);
1205 lseg->pls_layout = lo;
1206 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1211 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1213 BUG_ON(pgio->pg_lseg != NULL);
1215 if (req->wb_offset != req->wb_pgbase) {
1216 nfs_pageio_reset_read_mds(pgio);
1219 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1225 /* If no lseg, fall back to read through mds */
1226 if (pgio->pg_lseg == NULL)
1227 nfs_pageio_reset_read_mds(pgio);
1230 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1233 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1235 BUG_ON(pgio->pg_lseg != NULL);
1237 if (req->wb_offset != req->wb_pgbase) {
1238 nfs_pageio_reset_write_mds(pgio);
1241 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1247 /* If no lseg, fall back to write through mds */
1248 if (pgio->pg_lseg == NULL)
1249 nfs_pageio_reset_write_mds(pgio);
1251 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1254 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1255 const struct nfs_pgio_completion_ops *compl_ops)
1257 struct nfs_server *server = NFS_SERVER(inode);
1258 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1261 nfs_pageio_init_read(pgio, inode, compl_ops);
1263 nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
1267 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1269 const struct nfs_pgio_completion_ops *compl_ops)
1271 struct nfs_server *server = NFS_SERVER(inode);
1272 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1275 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
1277 nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
1281 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1282 struct nfs_page *req)
1284 if (pgio->pg_lseg == NULL)
1285 return nfs_generic_pg_test(pgio, prev, req);
1288 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1289 * Note that this test makes several assumptions:
1290 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1291 * is known to lie within the range.
1292 * - that the nfs_page being tested is known to be contiguous with the
1293 * previous nfs_page.
1294 * - Layout ranges are page aligned, so we only have to test the
1295 * start offset of the request.
1297 * Please also note that 'end_offset' is actually the offset of the
1298 * first byte that lies outside the pnfs_layout_range. FIXME?
1301 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1302 pgio->pg_lseg->pls_range.length);
1304 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1306 int pnfs_write_done_resend_to_mds(struct inode *inode,
1307 struct list_head *head,
1308 const struct nfs_pgio_completion_ops *compl_ops)
1310 struct nfs_pageio_descriptor pgio;
1313 /* Resend all requests through the MDS */
1314 nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
1315 while (!list_empty(head)) {
1316 struct nfs_page *req = nfs_list_entry(head->next);
1318 nfs_list_remove_request(req);
1319 if (!nfs_pageio_add_request(&pgio, req))
1320 nfs_list_add_request(req, &failed);
1322 nfs_pageio_complete(&pgio);
1324 if (!list_empty(&failed)) {
1325 /* For some reason our attempt to resend pages. Mark the
1326 * overall send request as having failed, and let
1327 * nfs_writeback_release_full deal with the error.
1329 list_move(&failed, head);
1334 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1336 static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
1338 struct nfs_pgio_header *hdr = data->header;
1340 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1341 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1342 PNFS_LAYOUTRET_ON_ERROR) {
1343 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1344 pnfs_return_layout(hdr->inode);
1346 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1347 data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
1349 hdr->completion_ops);
1353 * Called by non rpc-based layout drivers
1355 void pnfs_ld_write_done(struct nfs_write_data *data)
1357 struct nfs_pgio_header *hdr = data->header;
1359 if (!hdr->pnfs_error) {
1360 pnfs_set_layoutcommit(data);
1361 hdr->mds_ops->rpc_call_done(&data->task, data);
1363 pnfs_ld_handle_write_error(data);
1364 hdr->mds_ops->rpc_release(data);
1366 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1369 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1370 struct nfs_write_data *data)
1372 struct nfs_pgio_header *hdr = data->header;
1374 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1375 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1376 nfs_pageio_reset_write_mds(desc);
1377 desc->pg_recoalesce = 1;
1379 nfs_writedata_release(data);
1382 static enum pnfs_try_status
1383 pnfs_try_to_write_data(struct nfs_write_data *wdata,
1384 const struct rpc_call_ops *call_ops,
1385 struct pnfs_layout_segment *lseg,
1388 struct nfs_pgio_header *hdr = wdata->header;
1389 struct inode *inode = hdr->inode;
1390 enum pnfs_try_status trypnfs;
1391 struct nfs_server *nfss = NFS_SERVER(inode);
1393 hdr->mds_ops = call_ops;
1395 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1396 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1397 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1398 if (trypnfs != PNFS_NOT_ATTEMPTED)
1399 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1400 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1405 pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1407 struct nfs_write_data *data;
1408 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1409 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1411 desc->pg_lseg = NULL;
1412 while (!list_empty(head)) {
1413 enum pnfs_try_status trypnfs;
1415 data = list_first_entry(head, struct nfs_write_data, list);
1416 list_del_init(&data->list);
1418 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1419 if (trypnfs == PNFS_NOT_ATTEMPTED)
1420 pnfs_write_through_mds(desc, data);
1422 pnfs_put_lseg(lseg);
1425 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1427 pnfs_put_lseg(hdr->lseg);
1428 nfs_writehdr_free(hdr);
1430 EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
1433 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1435 struct nfs_write_header *whdr;
1436 struct nfs_pgio_header *hdr;
1439 whdr = nfs_writehdr_alloc();
1441 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1442 pnfs_put_lseg(desc->pg_lseg);
1443 desc->pg_lseg = NULL;
1446 hdr = &whdr->header;
1447 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1448 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1449 atomic_inc(&hdr->refcnt);
1450 ret = nfs_generic_flush(desc, hdr);
1452 pnfs_put_lseg(desc->pg_lseg);
1453 desc->pg_lseg = NULL;
1455 pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
1456 if (atomic_dec_and_test(&hdr->refcnt))
1457 hdr->completion_ops->completion(hdr);
1460 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1462 int pnfs_read_done_resend_to_mds(struct inode *inode,
1463 struct list_head *head,
1464 const struct nfs_pgio_completion_ops *compl_ops)
1466 struct nfs_pageio_descriptor pgio;
1469 /* Resend all requests through the MDS */
1470 nfs_pageio_init_read(&pgio, inode, compl_ops);
1471 while (!list_empty(head)) {
1472 struct nfs_page *req = nfs_list_entry(head->next);
1474 nfs_list_remove_request(req);
1475 if (!nfs_pageio_add_request(&pgio, req))
1476 nfs_list_add_request(req, &failed);
1478 nfs_pageio_complete(&pgio);
1480 if (!list_empty(&failed)) {
1481 list_move(&failed, head);
1486 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1488 static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
1490 struct nfs_pgio_header *hdr = data->header;
1492 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
1493 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1494 PNFS_LAYOUTRET_ON_ERROR) {
1495 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1496 pnfs_return_layout(hdr->inode);
1498 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1499 data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
1501 hdr->completion_ops);
1505 * Called by non rpc-based layout drivers
1507 void pnfs_ld_read_done(struct nfs_read_data *data)
1509 struct nfs_pgio_header *hdr = data->header;
1511 if (likely(!hdr->pnfs_error)) {
1512 __nfs4_read_done_cb(data);
1513 hdr->mds_ops->rpc_call_done(&data->task, data);
1515 pnfs_ld_handle_read_error(data);
1516 hdr->mds_ops->rpc_release(data);
1518 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1521 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1522 struct nfs_read_data *data)
1524 struct nfs_pgio_header *hdr = data->header;
1526 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1527 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1528 nfs_pageio_reset_read_mds(desc);
1529 desc->pg_recoalesce = 1;
1531 nfs_readdata_release(data);
1535 * Call the appropriate parallel I/O subsystem read function.
1537 static enum pnfs_try_status
1538 pnfs_try_to_read_data(struct nfs_read_data *rdata,
1539 const struct rpc_call_ops *call_ops,
1540 struct pnfs_layout_segment *lseg)
1542 struct nfs_pgio_header *hdr = rdata->header;
1543 struct inode *inode = hdr->inode;
1544 struct nfs_server *nfss = NFS_SERVER(inode);
1545 enum pnfs_try_status trypnfs;
1547 hdr->mds_ops = call_ops;
1549 dprintk("%s: Reading ino:%lu %u@%llu\n",
1550 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1552 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1553 if (trypnfs != PNFS_NOT_ATTEMPTED)
1554 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1555 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1560 pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1562 struct nfs_read_data *data;
1563 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1564 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1566 desc->pg_lseg = NULL;
1567 while (!list_empty(head)) {
1568 enum pnfs_try_status trypnfs;
1570 data = list_first_entry(head, struct nfs_read_data, list);
1571 list_del_init(&data->list);
1573 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1574 if (trypnfs == PNFS_NOT_ATTEMPTED)
1575 pnfs_read_through_mds(desc, data);
1577 pnfs_put_lseg(lseg);
1580 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
1582 pnfs_put_lseg(hdr->lseg);
1583 nfs_readhdr_free(hdr);
1585 EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
1588 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1590 struct nfs_read_header *rhdr;
1591 struct nfs_pgio_header *hdr;
1594 rhdr = nfs_readhdr_alloc();
1596 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1598 pnfs_put_lseg(desc->pg_lseg);
1599 desc->pg_lseg = NULL;
1602 hdr = &rhdr->header;
1603 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
1604 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1605 atomic_inc(&hdr->refcnt);
1606 ret = nfs_generic_pagein(desc, hdr);
1608 pnfs_put_lseg(desc->pg_lseg);
1609 desc->pg_lseg = NULL;
1611 pnfs_do_multiple_reads(desc, &hdr->rpc_list);
1612 if (atomic_dec_and_test(&hdr->refcnt))
1613 hdr->completion_ops->completion(hdr);
1616 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1619 * There can be multiple RW segments.
1621 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1623 struct pnfs_layout_segment *lseg;
1625 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1626 if (lseg->pls_range.iomode == IOMODE_RW &&
1627 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1628 list_add(&lseg->pls_lc_list, listp);
1632 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
1634 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1636 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
1639 pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1641 struct nfs_pgio_header *hdr = wdata->header;
1642 struct inode *inode = hdr->inode;
1643 struct nfs_inode *nfsi = NFS_I(inode);
1644 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1645 bool mark_as_dirty = false;
1647 spin_lock(&inode->i_lock);
1648 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1649 mark_as_dirty = true;
1650 dprintk("%s: Set layoutcommit for inode %lu ",
1651 __func__, inode->i_ino);
1653 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
1654 /* references matched in nfs4_layoutcommit_release */
1655 pnfs_get_lseg(hdr->lseg);
1657 if (end_pos > nfsi->layout->plh_lwb)
1658 nfsi->layout->plh_lwb = end_pos;
1659 spin_unlock(&inode->i_lock);
1660 dprintk("%s: lseg %p end_pos %llu\n",
1661 __func__, hdr->lseg, nfsi->layout->plh_lwb);
1663 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1664 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1666 mark_inode_dirty_sync(inode);
1668 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1670 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1672 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1674 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1675 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1679 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1680 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1681 * data to disk to allow the server to recover the data if it crashes.
1682 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1683 * is off, and a COMMIT is sent to a data server, or
1684 * if WRITEs to a data server return NFS_DATA_SYNC.
1687 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1689 struct nfs4_layoutcommit_data *data;
1690 struct nfs_inode *nfsi = NFS_I(inode);
1694 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1696 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1699 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1700 data = kzalloc(sizeof(*data), GFP_NOFS);
1706 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1709 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
1714 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
1715 nfs_wait_bit_killable, TASK_KILLABLE);
1720 INIT_LIST_HEAD(&data->lseg_list);
1721 spin_lock(&inode->i_lock);
1722 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1723 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
1724 spin_unlock(&inode->i_lock);
1725 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
1729 pnfs_list_write_lseg(inode, &data->lseg_list);
1731 end_pos = nfsi->layout->plh_lwb;
1732 nfsi->layout->plh_lwb = 0;
1734 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
1735 spin_unlock(&inode->i_lock);
1737 data->args.inode = inode;
1738 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1739 nfs_fattr_init(&data->fattr);
1740 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1741 data->res.fattr = &data->fattr;
1742 data->args.lastbytewritten = end_pos - 1;
1743 data->res.server = NFS_SERVER(inode);
1745 status = nfs4_proc_layoutcommit(data, sync);
1748 mark_inode_dirty_sync(inode);
1749 dprintk("<-- %s status %d\n", __func__, status);
1756 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
1758 struct nfs4_threshold *thp;
1760 thp = kzalloc(sizeof(*thp), GFP_NOFS);
1762 dprintk("%s mdsthreshold allocation failed\n", __func__);